Drill bit and sample-taking device



G. A. HUMASON AND P.1LBARRACO. I

DRILL BIT AND SAMPLE TAKING DEVICE.

APPLICATION FILED MAR. 10 1919. 1,437,805, Patented Dec. 5,1922.

2 SHEETS-SHEET 1.

G. A. HUMASON AND P. I. BAIIIIAUU. DRILL BIT AND SAMPLE TAKING DEVICE.

APPLICATION FILED MAR. I01 EH9.

2 SHEETSSHEET 2.

Patented Dec. 5, 1922.

I I h IHH HH I I I I I I I I I I IH I I I IHI HHH MM. 5 8 WWW ml II 7 i 1% nation of fishtail and Patented Dec. 5, R922.

UNETED stares smear cert GRANVILLE A. HUMASON ANDPAUL J. BARRACO, 0F HDU'STON,,TEXAS, ASSIGN 0. 33%, BY DIRECT AND MESH E ASSIGNMENTS, T0 TEXAS RECLAIM OIL ASSOCIATTQIG', GE HOUSTON, TEXAS, AN ASSOCIATION OF TEXAS.

DRILL BIT AND SAMPLE-TAKING DEVICE.

Application filed March 10,

cation to the drilling of wells in which it is desired that a complete and accurate log of the well be retained.

An object of our invention is to provide a drill capable of operating in soft or hard formations, but more especially in soft formations, and which will also preserve an accuraterecord of the material being drilled.

Another object is to provide a combicore bits in such mannerlthat the material constituting the core shall be preserved without mutilation or Washing away by the currentsof water used in the drilling operation.

Another object is to provide detachable cutting points for the drilling members which may be removed and sharpened or replaced without the necessity of providing an entirelynew bit.

Another object is to provide means for conducting the flushing water to the bit in such manner that it will most eficiently clean the bit and wash away the disintegrated material. Uther (objects and ad vantages will appear in the specification which follows:

Referring to the drawing forming a part of the specification and wherein like parts are designated by like numerals of reference throughout the several views, Fig. l is a side elevation of our improved drill bit; Fig. 2 is a similar view taken at right angles to that shown in Fig. 1, one-half thereof being in central longitudinal section; Fig.3 is a view similar 'to that shown in Fig. 2 illustrating a different embodiment of our invention; Fig. t is a perspective view of a detachable cutting member which may be used in connection with the embodiment shown in Fig. 3; Fig. 5 is a side elevation'of a bit such as disclosed in Fig. 3 but with the blades arranged spirally thereon; Fig.

It has especial appli-' at its upper end the entrance of foreign matter head 3, and having mortised portions,

1919. Serial No. 281,604.

6 is a bottom plan View of this embodiment;

1g. 7 is a side elevation of the bit, shown in Fig. 1 with the blades arranged spirally; and Fig. 8 is a bottom plan view of the embodiment shown in Fig. 7. Fig. 9 is an elevation, partly in crosssection, of the bit shown in Fig. 8. V

, In the embodiment closed in Figs. 1 and core drill comprising a lindrical in shape and having an upwardly projecting shank 2 of smaller diameter and threaded for attachment to the drill stem, not shown. The lower portion of the head 1 is reduced in diameter to form a tubular portion 3. This tubular member is formed with an inner bore 6 adapted to receive an inner sleeve 7 extending upwardly therethrough and through the shank 2 of the bit and projecting above the samefor threaded attachment with a coupling member 10 connecting the same with a core barrel 1a of ordinary construction. This core barrel has a ball valve 15 to prevent thereto but of fluid therefrom. The tube 7 has an enlarged diameter as the tubular its upper face contact with the shoulder 9 at the lower end of said tube. This head 8 is toothed at its lower end for the purpose of cutting the material in of our invention dis- 2 we have shown a head 1 somewhat cyto allow the escape lower end of the head 8 of the same the drilling operation.

To the opposite sides of the tubular portion 3 of the drill are attached fish-tail blades l which are provided at their lower ends with detachable points 5, said points being mortised at their upper portions to fit .upon tenons onthe lowerends of the blades 4 and are secured in position thereon by pins 11 extending transversely. through said as will be noticed from the drawings. These two lateral blades are of the fish-tail type, the detachable points being extended forwardly in the direction of rotation of the bit so as tomore efi'iciently perform the cutting operation. They are arranged above the core cutting means 8 so that the core bit will cut a pilot hole which will be enlarged by thefish-tail blades which follow.

Flushing water is supplied to these blades at both their upper and lower ends. The channelsjl3 extend from the'upper shank of the bit downwardly in an inclined direction to discharge the water at the upper ends .of the blades in such manner that it will flush the upper face thereof. Channels 12,

extending from the upper end of the shank 2, carry the water downwardly in a direction inclined slightly outwardly to the detachable cutting points and deliver the water upon the advancing face of the points of the blades. As will-be noted, there are two of these channels 12, one discharging upon the forward face of one of the blades and the other upon the forward face of the opposite blade. i

In assembling the parts of this bit the detachable point of the core drill may be attached to the headiof the drill by extending the tubular attaching member 7 upwardly through the center of the head and threading the same into the collar 10 at theupper-i bit 8, which extends in advance of the fishtail blades, will cut a small hole leaving a.

central core which will be worked graduall up through the central channel in the drill and intothe core barrel 14 above the drill and may be later'withdraw'n from the well. In soft material the use of-a strong 2 stream of flushing water is liable to destroy the central core so that no proper record of the well may be obtained. But by having the core bit extended in advance of the fish-' tail blades and the flushing water which is a pilot bit in advance of the blades serves to used therewith, it is possible to obtain a core of the soft material untouched by the flush ing water and thus capable of being preserved intact. The fish tail blades 4 enlarge the hole cut by the core bit to the size desired. It has been foundthat the use of steady the drill and to increase the cutting efliciency of the drill. Making the points detachable in the manner shown makes it possible to renewthe toothed points whenever necessary. The discharge of the flushing water by means of two streams, one on the upper face of the blade and the other by means of a channel which discharges the water outwardly in an inclined direction, so

. as to flush away the material tending to gather on the forward face of the blade, is such that the blade will be more efliciently cleaned of material -at all times. 4

In the embodiment shown in Figs. 3 and a4, the construction of the head of the bit is practically identical with that shown in 'headis shown. made,- however, in that the blades 4" are the embodiment justdescribed. It has this difference, however, that the detachablepoints upon the fishtail blades and upon the core drill are made integral so that they may bedetached from the drill together, with one operation. The detachable points 5, principally on the fish-tail blade are me!- tised within the lower end ofthe blades l, and secured therein by'means of pins 11. The points 5 being made integral with the point 8" of the core drill enablethe detachable points 5 to be further secured in position by means of theattaching tube 7 which extends upwardly through the head of-the bit and is secured within the collar 10.

In Fig. 4 is shown a detachable cutting portion for the bit, shown in Fig. 3, which does away with the core bit arrangement. This attachment may be secured to the end .of the drill shown in Fig. 3 by removing the detachable points for the fish-tail and coredrill and substituting therefor the blade shown in Fig. 4:. This is done, as will be obvious, by extending the attaching tube 7" upwardly'through the central portion of the drill. and securing-the same by a detachable collar 10 such as is shown in Fig. 4. The flushing water in' this modification will be delivered to the cutting points inthe usual manner but there will also be a central chandrill is not desired and still secure the ad vantage of the detachable points.

In Figs. 5 and 6 the arrangement whereby the detachable points 5" are secured to the A slight change has been arranged spirally relative to the central head 3 of the. drill. The arranging of the nel 16 extending downwardly to discharge between thetwo points 5" .of the fish-tail blade.- The use of this attachment will make it possible to' operate this drill where a core blades in this inclined or spiral position serves to clean the blades somewhat more efliciently. .The arrangement is such' that the lower ends of the blades incline forwardly in the direction of rotation of the bit and this inclination and the rotation of the bit serve to force the disintegrated matter upwardly along the inclined face of the blade and thus scour and clean the blade more efiiciently.

Figs. 7, 8 and 9 show the embodiment disclosed in Figs. 1 and 2 with the spiral arrangement of the blades 4.? disclosed in Figs. 5 and 6. The remaining portion of the bit .is identical with that disclosed in the embodiment first described;

What we claim is:

1. In a drill bit, a cylindrical head, means on the forward end thereof to cut a ilot hole,.spiral blades on said head to en arge the hole behind said forward cutting means and means to deliver flushin water on the advancing faces of said bla es.

2. In a drill bit, a cylindrical head, a' removable core cutting means on the forward end thereof, laterally extending blades on said head to drill a hole outside said core cutting means, said blades being inclined forward at the lower end for the purpose described.

3. In a drill bit a cylindrical head, a core cutting means thereon, laterally extending blades on said head'to enlarge the hole cut by said core cutter, the points of said blades being detachable for the purpose described.

4. In a drill bit, a tubular head and opposite blades arranged spirally on the sides of said head, said blades having detachable cutting points.

5. In a drill bit the combination of a core drill, and opposite fish tail blades on the sides thereof, said blades being spirally arranged and spaced backwardly from the cutting portion of'said core drill.

6. In a rotary drill, a central tubular core drill, a removable cutting head thereon, a" sleeve on said cutting head fitting in said tubular core drill, inclined blades on opposite sides of said tubular drill and detachable points on said blades.

7. A rotary boring drill comprising a head, a tubular core drill formed thereon, lateral blades formed longitudinally of said head and integral therewith, a. sharp cutting edge on said core drill positioned to drill a pilot hole in advance of said blades.

8. A rotary boring drill comprising a head, a tubular core bit thereon, said head having a'central bore longitudinally thereof, a sleeve extending upwardly through said bore, a cutting edge for said core bit on said sleeve, means to secure said sleeve in said head and lateral fish tail blades on said head. y

9. A rotary boring drill comprising a tubular head with a central bore therein, a sleeve fitted through said bore whose forward end is formed into a cutting point, lateral blades on said head and detachable cutting points on said blades.

10,. A drill bit including a tubular head, detachable cutting means thereon, lateral blades on said tubular head and integral therewith, said blades being inclined forwardly toward their lower ends, and detachable cutting points on said blades.

11. A drill bit including a head, lateral blades arranged spirally on'said head, water courses adapted to deliver water from the forward faces of said blades both at the upper and lower ends thereof.

12. A drill bit including a cylindrical head, cutting means on the forward end thereof, lateral blades on said head behind said cutting means, said blades being spirally arranged on said head and water courses so formed in said head and blades as to direct water on the upper face of each of said blades and separate water courses discharging from the lower cutting points 1 thereof.

13. In a drill bit, the combination of a central core drill, with fish tail blades on opposite sides thereof, and means so arranged as to flush said blades only and core drill spaced forwardly from said blades in the manner described.

14. In a drill bit. the combination of a central core drill, fish-tail blades formed 'integrally on opposite sides thereof, detachable points on said core drill and blades, and channels in said head and 'blades to flush the forward faces of said blades.

In testimony whereof they have signed their names to this specification in the presence of two subscribing witnesses.

GRANVILLE A. HUMASON. PAUL J. BARRACO. Witnesses:

C. R. STONE, E. V. HARDWAY. 

